On years past, P/L winners had the following points totals:
1) 1992/93 - Man Utd - 84/22
2) 1993/94 - Man Utd - 92/22
3) 1994/95 - Blackburn - 89/22
4) 1995/96 - Man Utd - 82/20
5) 1996/97 - Man Utd - 75
6) 1997/98 - Arsenal - 78
7) 1998/99 - Man Utd - 79
8) 1999/00 - Man Utd - 91
9) 2000/01 - Man Utd - 80
10) 2001/02 - Arsenal - 90
11) 2002/03 - Man Utd - 83
12) 2003/04 - Arsenal - 90
13) 2004/05 - Chelsea - 95
14) 2005/06 - Chelsea - 91
15) 2006/07 - Man Utd - 89
16) 2007/08 - Man Utd - 87
17) 2008/09 - Man Utd - 90
18) 2009/10 - Chelsea - 86
19) 2010/11 - Man Utd - 80
20) 2011/12 - Man City - 89
21) 2012/13 - Man Utd - 89
22) 2013/14 - Man City - 86
23) 2014/15 - Chelsea - 87
24) 2015/16 - Leicester - 81
25) 2016/17 - Chelsea - 93
26) 2017/18 - Man City - 100
26 years.
Need to beat 13 to be above 50% to win, notwithstanding 22 teams in years 1-3.
Say 87 - beats 11, ties 2
Say 88 - beats 13, ties 0
City are well above most other sides, with, I think, Liverpool best placed to challenge. MU/Arsenal/Chelsea/Spurs are about equal.
In an "average" year, it looks, historically as-if 88 or so will suffice - but Pool are strong (still need a keeper?). So 89-90?
So, at a guess, I'll say 90 points will suffice to win the league.